Internal grinding fixture



June a, 1924. 1,496,107

H. c. WEBER INTERNAL GRINDING FIXTURE Filed March 5, 1921 I fm e 28/1 M f IWJ Patented June 3, 1924.

ATENT OFFICE.

HENRY C. VJEBER, F MILWAUKEE, WISCONSIN, ASSIGNOR 0F ONE-HALF T0 THOMAS A T. MADDEN, OF MILWAUKEE, WISCONSIN.

INTERNAL GRINDING FIXTURE.

-App1ication filed March 3, 1921. Serial No. 449,339.

To all whom it may concern.

Be it known that I, HENRY C. itanic, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Internal Grinding Fixtures, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention relates to improvements in internal grinding fixtures.

Internal grinding fixtures now in general use are attachable to universal machines of the lathe type and are provided with removable grinding spindles, and these spindles are secured to the driving shaft by ad justable means adjacent the spindle end of the fixture, with the result that in use the spindles are often knocked out of true running position in adjusting spindles in position.

It is one of the objects of the present invention to overcome the above mentioned objectionable feature, and provide an internal grinding fixture which may be easily mounted upon a: universal machine and in which the grinding spindles are secured to the driving shaft by means controlled at the opposite end of the fixture to that to which the grind ing spindle isv connected.

A further object of the invention is to rovide an internal rindin fixture in which grinding spindles of various diameters may be easily clamped to the driving shaft to grind work of various diameters.

A further object of the invention is to provide an internal grinding fixture in which the driving shaft is journaled in ball bearings and the bearings are protected in a manner to prevent the entrance of dust thereto. I

A further objeet of the invention is to provide an internal grinding fixture in which the parts may be easily disassembled when desired.

A further object of the invention is to provide an internal grinding fixture which is of simple construction, is strong and durable, and is well adapted for the purpose described. I

With the above and other objects in view, the invention consists of the improved internal grinding fixture and its parts and combinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawing in which the same reference characters indicate the same parts in all of the views:

Fig. 1 is a perspective view of the improved internal grinding fixture shown mounted upon a portion of a universal machine of the lathe type;

Fig. 2 is a central longitudinal sectional View, on a larger scale, of the internal grind- Fig. 3 is an end detail view of the end portion of the chuck; and

Fig. 4 is a side View of a smaller size grinding wheel and spindle.

Referring to the drawing, the numeral 8 indicates a portion of a universal machine of the lathe type which is provided with longitudinal and transverse guide ways 9 and- 10 and a transversely movable carriage 11 which is adjustably connected to the guide ways 10. The improved grinding fixture 12 is provided with a laterally extending arm 13 having an elongated slot 14; A bolt 15 extending through the slot and threaded into the carriage adjustably holds the grinding fixture in position to grind work held by the rotating head of the lathe (not shown). Two spaced tubular bearing supporting members 16, formed integral with the arm 13, have bearing blocks 17 positioned therein which are removably maintained in position by set screws 18. Said blocks are formed with inner bores 19 and outer bores 19 of larger diameter, and said outer bores 19 are threaded to receive holding nuts 20 threaded therein.

Interposed between the shoulders 21 formed by bores of less diameter and the holding nuts 20, are positioned the outer fixed portions 22 of ball bearings, and said outer portions are firmly clamped therebetween. A tubular sleeve 23, extending through the bearing blocks 17 and the holding nuts 20, and free from contact therewith, is formed with an annular shoulder 23' on its inner end and a threaded portion 24 on its outer end. A pulley sleeve 25 snugly fitting the tubularsleeve 28 is formed with extensions 25 which pass freely through the bores 19 of the bearing blocks 17 but do not contact therewith. The inner or revoluble parts 22 of the ball bearings are firmly mounted on the tubular sleeve 23, and at theinnei-z endof saidlsleeve-one; ot" the bearing, parts 22 is interposed betweenthe shoulder 23 and the adjacent inner end of the extension 25.. The other or outer revoluble part 22 is interposedbetween the outer end of the other extension 25 and a nut 26 threaded on the outer end of the tubular sleeve 23. Said nut 26 firmly clamps the inner bearing parts 22; on the tu-; bular sleeve 23 and in alinement with the outer bearing; parts 22,. and also firmly. clamps the pulley sleeve 25 to the tubular sleeve -23.

To prevent the entrance of-dusti orother foreign matter into the ball-ibearings;v the blocks-17 and the holc'ling-nu-ts 20 are provided. withannular recesses 21 and 27! in. their bioresfor holding felt rings 28 which bear against the tubular; sleeve 23: and the pulley extensions 25 on opposite sides, of each ball bearing.

Oil cups 28 provide for oiling the bears ings.

Extending through the-tubular sleeve-23 is a chuck bolti29 having a spindle=recess 80 formed in its inner endrfor receiving the spindles 31 of grinding wheels 32. Said recessed-end is formed witha plurality of transverse. cuts 33' toform chuck or clampingjaws 3d to, firmly. gripspindles 31 insertedinto the recess. 30.v The outer portion of the recessed end of the chuck bolt:- is tae pered, asindicatedby thenumeral 35,- and theportion 36' of thebore -of the adjacent endof the tubular sleeve 23 is-corresp ondingly. tapered, so. that when the recessed end pingthebolt endwise when it lS-ClQSll'QCbtO release the grinding spindles.

The form-shown in Fig. 4 illustrates the shape of the spindle for small grinding wheels.

In usethefixture ismounted on the crossfeed carriage of a universal machine; and the pulley member 25- is connected to a source of motion by a belt 39 in the usual mannen The clamping nutz37 is.-no\v loosened and. the grinding wheelspindle is inserted in the chuck recess, and the clamping nut is tightened to draw the chuckbolt. to clamp- (K) ing position and to clamp the bolt to the tubular sleeve. As the chuck is opened and closed from the'opposite end to which the spindle is connected, there is no liability of thespindle beingknocked or sprung out of true axial alinement with the axis of rotation of the tubular sleeve and a.- better class ot: work will .result.

Fronr-the foregoing: description it willibeseen that' the invention iswell adapted for tape-red clamping -j aw end portion which engages the tapered recess ofthe tubular member-, and anut: threadedon the'end of the clamping member opposite -.to:the jaw end andexerting: a strain against the end of the pulley sleeve for moving the clamping menr 95 her longitudinally and clampingthe said member to the tubularisleeve and the tubular sleeve to the pulley sleeve.

2. A- grinding'fixture,coinprising a sup- )ort' a ou'lle sleeve-extendin into said su l I Y a 1 port,- a tubular member: extending through the-sleeve and havinga tapered end, recess anda shoulder atone end, a clamping member extending through the tubular member and 'having a irecessed Land tape-red clampingjaw end portion 1 Wlriclr engages the tapered recess of the tubular memberg-a' nut-thread ed onthe tubular member opposite to the shouldered end tori clamping the tubular member to. thetubular sleeve; and anut threaded'ion the end of the clamping member opposite to the: 1am end and engaging the tubular member nut for moving'said clampingr member longitudinally and clamping thesaidclamping: member to the tubularsleeve and further clamping thetubu-lar member to the pulley sleeve'and lockiing the'tubular member nut in adjusted position.

In testimony whereof I afli-x :my signature:

HENRY C. WEBER:

extending 75 

